Coal burning boiler

Abstract

The invention discloses a coal burning boiler. The coal burning boiler comprises a chain grate which penetrates through a hearth, is used for conveying coal and is used as a fire bed and a coal supply device. The hearth comprises a front arch, a back arch, a water cooling wall and a channel thereof. The coal burning boiler further comprises a coal-water slurry burner and a coal-water slurry conveyer system which provides the coal-water slurry burner with fuel, wherein, the coal-water slurry burner is arranged at the middle part between the front arch and the back arch and the chain grate is used as an igniting device. The invention provides a coal burning boiler which combines coal-water slurry with fire coal; the fuel consumed for unit heat production is low; the range of the burned coal is wide; and the coal burning boiler improves the boiler steam rate.

Description

(1) Technical field

[0001] The invention relates to a coal-fired boiler, in particular to a coal-fired boiler with a chain grate. (2) Background technology

[0002] Chain boilers in coal-fired boilers are thermal equipment commonly used by small and medium-sized enterprises. They have a history of more than 100 years. Although they have undergone many large-scale technological innovations, their thermal efficiency is still lower than 60%, and the actual output can only reach 60%. %~70%. Because the chain boiler has a strong selectivity to the coal it burns, that is to say, when designing, the first thing to determine is the type of coal or other fuels to be used, and then design the shape and size of the arch according to the type of coal used. After installation, the shape and size of the arch designed according to the type of coal burned cannot be changed, causing it to only burn the type of coal designed or similar to the type of coal, so the adaptability to the type of ...

Examples

Embodiment Construction

[0024] Refer to the attached figure 1 and 2 The coal-fired boiler of this embodiment includes a chain grate 8 and a coal feeding device passing through the furnace for coal delivery and as a fire bed. The furnace includes a front arch 10 and a rear arch 5, and a water-cooled wall 2 and Its header 7, the coal-fired boiler further includes a coal-water slurry burner 11 and a coal-water slurry delivery system that provides fuel for the coal-water slurry burner, wherein the coal-water slurry burner is located in the middle between the front and rear arches of the furnace, and The chain grate system is used as the ignition device.

[0025] Preferably, the coal-water slurry burner is located at the center of the water-cooled wall in the furnace arch, where the radiation heat of the furnace arch is relatively large, and it is located on the upper part of the fire bed, which facilitates the ignition of the coal-water slurry. On the other hand, the radiant heat to the water wall can ...

(1) Technical field

[0001] The invention relates to a coal-fired boiler, in particular to a coal-fired boiler with a chain grate. (2) Background technology

[0002] Chain boilers in coal-fired boilers are thermal equipment commonly used by small and medium-sized enterprises. They have a history of more than 100 years. Although they have undergone many large-scale technological innovations, their thermal efficiency is still lower than 60%, and the actual output can only reach 60%. %~70%. Because the chain boiler has a strong selectivity to the coal it burns, that is to say, when designing, the first thing to determine is the type of coal or other fuels to be used, and then design the shape and size of the arch according to the type of coal used. After installation, the shape and size of the arch designed according to the type of coal burned cannot be changed, causing it to only burn the type of coal designed or similar to the type of coal, so the adaptability to the type of ...

Examples

Embodiment Construction

[0024] Refer to the attached figure 1 and 2 The coal-fired boiler of this embodiment includes a chain grate 8 and a coal feeding device passing through the furnace for coal delivery and as a fire bed. The furnace includes a front arch 10 and a rear arch 5, and a water-cooled wall 2 and Its header 7, the coal-fired boiler further includes a coal-water slurry burner 11 and a coal-water slurry delivery system that provides fuel for the coal-water slurry burner, wherein the coal-water slurry burner is located in the middle between the front and rear arches of the furnace, and The chain grate system is used as the ignition device.

[0025] Preferably, the coal-water slurry burner is located at the center of the water-cooled wall in the furnace arch, where the radiation heat of the furnace arch is relatively large, and it is located on the upper part of the fire bed, which facilitates the ignition of the coal-water slurry. On the other hand, the radiant heat to the water wall can ...

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